Planar Curb System for Concrete Container Leakage
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Solution Overview
Problem
Tall concrete containers face structural failures due to shear force on keyways, leading to spalling and grout cracking, which are not suitable for heavy loads and tall heights, necessitating an alternative design that eliminates keyways and allows walls to be placed on a planar base slab.
Innovation Solution
A curb system comprising a planar base slab with inner and outer curbs, expandable waterstops, and reinforcing members that provide a secure and watertight seal, allowing the walls to be set on a flat surface without keyways, using materials like PVC, polyurethane, and sodium bentonite for the waterstops and rebar for reinforcing members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If keyways are used to restrain concrete walls during construction, then the walls are secured at the base, but shear force causes spalling and grout cracking in tall containers with heavy loads
Solution Approach 1:
The patent removes the keyway feature from the base slab, eliminating the source of structural failure. Instead of having recessed keyways that concentrate stress, the invention uses a planar base slab surface that distributes loads evenly, preventing spalling and grout cracking while maintaining wall restraint through the curb system
Solution Approach 2:
The invention employs a composite sealing system combining expandable waterstop material (such as sodium bentonite or polyurethane) with concrete curbs. The expandable material swells to fill gaps and create a watertight seal, while the concrete curbs provide structural restraint, together creating a system that handles both sealing and structural functions without the failures associated with traditional keyways
2Ease of manufacture
If traditional keyway systems are used, then construction is simplified, but the system is not suitable for tall containers with heavy loads
Solution Approach 1:
The planar base slab with curb system serves multiple functions: it provides a stable construction surface for placing walls, creates effective waterproofing through the expandable waterstop, and delivers structural restraint against lateral loads. This multi-functional system replaces the keyway's combined roles while adapting to both low and tall container applications
Solution Approach 2:
The invention changes the geometric parameters of the base slab from having recessed keyways to a planar surface with protruding curbs. This parameter change allows the system to accommodate tall containers with heavy loads while maintaining ease of construction through simple formwork and pouring processes
3Reliability
If walls are placed on a planar base slab without keyways, then structural failures are prevented, but additional waterproofing measures are required
Solution Approach 1:
The expandable waterstop material acts as an intermediary element between the concrete curb and the wall/base slab interface. This material swells upon contact with water to fill any gaps and create a reliable seal, simplifying the waterproofing requirement while maintaining structural integrity without complex multi-layer sealing systems
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The curb system effectively prevents leakage and structural failures by providing a tight seal and distributing loads evenly, eliminating the need for keyways and enhancing the structural integrity of tall concrete containers.
Implementation Method 1
A first expandable waterstop is positioned between the inner curb and the inner surface of the wall
Implementation Method 2
using materials like PVC, polyurethane, and sodium bentonite for the waterstops
Data Source
AI summary
A curb system for a concrete container is disclosed. The curb system includes a base slab having a planar mounting surface and a wall positioned on the planar mounting surface. An inner curb is positioned on the planar mounting surface adjacent to an inner surface of the wall, and an outer curb is positioned on the planar mounting surface adjacent to an outer surface of the wall. A first expandable waterstop is positioned between the inner curb and the inner surface of the wall. A first waterstop is positioned between the inner curb and the planar mounting surface.